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/* RCSid: $Id: pcond.h,v 3.13 2004/11/08 15:50:59 greg Exp $ */
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/*
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* Header file for picture file conditioning.
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*/
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#ifndef _RAD_PCOND_H_
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#define _RAD_PCOND_H_
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#include "standard.h"
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#include "color.h"
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#include "view.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef ADJ_VEIL
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#define ADJ_VEIL 0 /* adjust veil to preserve contrast? */
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#endif
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#define SWNORM 2.26 /* scotopic/photopic ratio for white */
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#define WHTSEFFICACY (SWNORM*WHTEFFICACY)
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#define BotMesopic 5.62e-3 /* top of scotopic range */
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#define TopMesopic 5.62 /* bottom of photopic range */
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#define FOVDIA (1.0*PI/180.0) /* foveal diameter (radians) */
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#define HISTRES 100 /* histogram resolution */
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#define MAXPREHIST 1024 /* maximum precomputed histogram */
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#define LMIN 1e-7 /* minimum visible world luminance */
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#define LMAX 1e5 /* maximum visible world luminance */
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#define Bl(Lw) log(Lw) /* brightness function */
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#define Bl1(Lw) (1.0/(Lw)) /* first derivative of Bl(Lw) */
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#define Lb(Bw) exp(Bw) /* inverse of brightness function */
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#define Lb1(Bw) exp(Bw) /* first derivative of Lb(Bw) */
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/* Flags of what to do */
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#define DO_ACUITY 01
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#define DO_VEIL 02
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#define DO_HSENS 04
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#define DO_COLOR 010
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#define DO_CWEIGHT 020
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#define DO_FIXHIST 040
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#define DO_PREHIST 0100
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#define DO_LINEAR 0200
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#define DO_HUMAN (DO_ACUITY|DO_VEIL|DO_HSENS|DO_COLOR)
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extern int what2do; /* desired adjustments */
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extern double ldmax; /* maximum output luminance */
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extern double lddyn; /* display dynamic range */
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extern double Bldmin, Bldmax; /* Bl(ldmax/lddyn) and Bl(ldmax) */
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extern char *progname; /* global argv[0] */
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extern char *infn; /* input file name */
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extern FILE *infp; /* input stream */
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extern double (*lumf)(); /* input luminance function */
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extern double inpexp; /* input exposure value */
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#define plum(clr) ((*lumf)(clr,0)/inpexp)
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#define slum(clr) ((*lumf)(clr,1)/inpexp)
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#define ldmin (ldmax/lddyn)
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extern COLOR *fovimg; /* foveal (1 degree) averaged image */
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extern int fvxr, fvyr; /* foveal image resolution */
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extern float *crfimg; /* contrast reduction factors */
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#define fovscan(y) (fovimg+(y)*fvxr)
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#define crfscan(y) (crfimg+(y)*fvxr)
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extern double fixfrac; /* histogram share due to fixations */
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extern short (*fixlst)[2]; /* fixation history list */
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extern int nfixations; /* number of fixation points */
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extern double bwhist[HISTRES]; /* luminance histogram */
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extern double histot; /* total count of histogram */
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extern double bwmin, bwmax; /* histogram limits */
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extern double bwavg; /* mean brightness */
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#define bwhi(B) (int)(HISTRES*((B)-bwmin)/(bwmax-bwmin))
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extern RGBPRIMP inprims; /* input primaries */
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extern COLORMAT inrgb2xyz; /* convert input RGB to XYZ */
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extern RGBPRIMP outprims; /* output primaries */
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extern double scalef; /* linear scaling factor */
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extern VIEW ourview; /* picture view */
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extern double pixaspect; /* pixel aspect ratio */
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extern RESOLU inpres; /* input picture resolution */
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extern char *mbcalfile; /* macbethcal mapping file */
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extern char *cwarpfile; /* color warp mapping file */
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/* defined in pcond.c */
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extern void syserror(char *s);
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/* defined in pcond2.c */
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extern double rgblum(COLOR clr, int scotopic); /* compute (scotopic) luminance of RGB color */
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extern double cielum(COLOR xyz, int scotopic); /* compute (scotopic) luminance of CIE color */
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extern COLOR *nextscan(void); /* next processed scanline */
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extern COLOR *firstscan(void); /* first processed scanline */
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/* defined in pcond3.c */
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extern void getfixations(FILE *fp); /* load fixation history list */
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extern void gethisto(FILE *fp); /* load precomputed luminance histogram */
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extern void comphist(void); /* create foveal sampling histogram */
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extern double htcontrs(double La); /* human contrast sens. func. */
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extern double clampf(double La); /* histogram clamping function */
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extern double crfactor(double La); /* contrast reduction factor */
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extern int mkbrmap(void); /* make dynamic range map */
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extern void putmapping(FILE *fp); /* put out mapping function */
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extern void scotscan(COLOR *scan, int xres); /* apply scotopic color sensitivity loss */
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extern void mapscan(COLOR *scan, int xres); /* apply tone mapping operator to scanline */
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/* defined in pcond4.c */
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extern void compveil(void); /* compute veiling image */
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#if ADJ_VEIL
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extern void adjveil(void); /* adjust veil image */
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#endif
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extern void acuscan(COLOR *scln, int y); /* get acuity-sampled scanline */
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extern void addveil(COLOR *sl, int y); /* add veil to scanline */
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extern void initacuity(void); /* initialize variable acuity sampling */
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extern double hacuity(double La); /* human acuity func. (cycles/deg.) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_PCOND_H_ */
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